/*
 * @Description:
 * @version:
 * @Author: GanEhank
 * @Date: 2019-08-04 02:31:14
 * @LastEditors: GanEhank
 * @LastEditTime: 2019-08-14 10:19:56
 */
/**
 * 构造一个Song类
 * JavaScript constructor 属性返回对创建此对象的数组函数的引用
 * 设计为类而不是对象的好处：
 * 1.可以把代码集中的一个地方维护
 * 2.类的扩展器比对象的扩展器强很多，而且它是一种面向对象的编程方式
 */

import { getLyric } from '@/api/song'
import { ERR_OK } from '@/api/config'
import { Base64 } from 'js-base64'

export default class Song {
  constructor({ id, mid, singer, name, album, duration, image, url }) {
    this.id = id
    this.mid = mid
    this.singer = singer
    this.name = name
    this.album = album
    this.duration = duration
    this.image = image
    this.url = url
  }
  getLyric() {
    if (this.lyric) {
      return Promise.resolve()
    }
    return new Promise((resolve, reject) => {
      getLyric(this.mid).then((res) => {
        if (res.retcode === ERR_OK) {
          this.lyric = Base64.decode(res.lyric) // 解码 得到字符串
          resolve(this.lyric)
        } else {
          /* eslint-disable prefer-promise-reject-errors */
          reject('no lyric')
        }
      })
    })
  }
}

// 抽象出一个工厂方法：传入musicData对象参数，实例化一个Song
export function createSong(musicData, songVkey) {
  return new Song({
    id: musicData.songid,
    mid: musicData.songmid,
    singer: filterSinger(musicData.singer),
    name: musicData.songname,
    album: musicData.albumname,
    duration: musicData.interval, // 歌曲时长s
    image: `https://y.gtimg.cn/music/photo_new/T002R300x300M000${musicData.albummid}.jpg?max_age=2592000`,
    // url: `http://ws.stream.qqmusic.qq.com/${musicData.songid}.m4a?fromtag=46`
    // 注意guid以实时数据为主
    url: `http://ws.stream.qqmusic.qq.com/C400${musicData.songmid}.m4a?vkey=${songVkey}&guid=6319873028&uin=0&fromtag=66`
  })
}

// 格式化处理singer数据
export function filterSinger(singer) {
  const ret = []
  if (!singer) {
    return ''
  }
  singer.forEach((s) => {
    ret.push(s.name)
  })
  return ret.join('/')
}

export function creatSongList(musicData, songVkey) {
  return new Song({
    id: musicData.id,
    mid: musicData.mid,
    singer: filterSinger(musicData.singer),
    name: musicData.name,
    album: musicData.albumname,
    duration: musicData.interval,
    image: `https://y.gtimg.cn/music/photo_new/T002R300x300M000${musicData.album.mid}.jpg?max_age=2592000`,
    // 注意guid以实时数据为主
    url: `http://ws.stream.qqmusic.qq.com/C400${musicData.mid}.m4a?vkey=${songVkey}&guid=6319873028&uin=0&fromtag=66`
  })
}
